Surgical end effectors with jaw stiffener arrangements configured to permit monitoring of firing member

ABSTRACT

An end effector for use with a surgical instrument. The end effector includes first and second jaws that are pivotally interconnected and moved between open and closed positions by a firing member. One or both of the jaws are configured with jaw stiffener features that are adapted to permit a user to monitor movement of the firing member during use.

BACKGROUND

The present invention relates to surgical instruments and, in various arrangements, to surgical stapling and cutting instruments and staple cartridges for use therewith that are designed to staple and cut tissue.

BRIEF DESCRIPTION OF THE DRAWINGS

Various features of the embodiments described herein, together with advantages thereof, may be understood in accordance with the following description taken in conjunction with the accompanying drawings as follows:

FIG. 1 is a perspective view of an electromechanical surgical system;

FIG. 2 is a perspective view of a distal end of an electromechanical surgical instrument portion of the surgical system of FIG. 1;

FIG. 3 is an exploded assembly view of an outer shell feature and the electromechanical surgical instrument of FIG. 2;

FIG. 4 is a rear perspective view of a portion of the electromechanical surgical instrument of FIG. 2;

FIG. 5 is a partial exploded assembly view of a portion of an adapter and the electromechanical surgical instrument of the surgical system of FIG. 1;

FIG. 6 is an exploded assembly view of a portion of the adapter of FIG. 5;

FIG. 7 is a cross-sectional perspective view of a portion of an articulation assembly of an adapter;

FIG. 8 is a perspective view of the articulation assembly of FIG. 7;

FIG. 9 is another perspective view of the articulation assembly of FIG. 8;

FIG. 10 is an exploded assembly view of a loading unit employed in the electromechanical surgical system of FIG. 1;

FIG. 11 is a perspective view of an alternative adapter embodiment;

FIG. 12 is a side elevational view of a portion of a loading unit of the adapter of FIG. 11 with the jaws thereof in an open position;

FIG. 13 is another side elevational view of a portion of the loading unit of FIG. 11 with portions thereof shown in cross-section and the jaws thereof in a closed position;

FIG. 14 is a bottom view of a portion of the loading unit of FIG. 13 with portions thereof shown in cross-section;

FIG. 15 is a perspective view of a portion of the loading unit of FIG. 14 with a portion of the outer tube shown in phantom lines;

FIG. 16 is a top perspective view of another loading unit of an adapter with the jaws thereof in a closed position and a dynamic clamping assembly positioned in a firing position;

FIG. 17 is a bottom perspective view of the loading unit of FIG. 16;

FIG. 18 is a side elevational view of the loading unit of FIG. 16 with the jaws in the closed position;

FIG. 19 is another side elevational view of the loading unit of FIG.18 with the dynamic clamping assembly positioned in a firing position;

FIG. 20 is another side elevational view of the loading unit of FIG. 19 with the dynamic clamping assembly in a partially fired position;

FIG. 21 is another side elevational view of the loading unit of FIG. 20 with the dynamic clamping assembly positioned in the ending position;

FIG. 22 is a partial side elevational view of another loading unit illustrating a dynamic clamping assembly thereof in a partially fired configuration;

FIG. 23 is a cross-sectional end view of a portion of an anvil assembly of a loading unit; and

FIG. 24 is a cross-sectional end view of a portion of another anvil assembly of a loading unit.

Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate various embodiments of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION

Applicant of the present application owns the following U.S. Patent Applications that were filed on even date herewith and which are each herein incorporated by reference in their respective entireties:

U.S. patent application Ser. No. ______, entitled SEALED ADAPTERS FOR USE WITH ELECTROMECHANICAL SURGICAL INSTRUMENTS; Attorney Docket No. END8286USNP/170227;

U.S. patent application Ser. No. ______, entitled END EFFECTORS WITH POSITIVE JAW OPENING FEATURES FOR USE WITH ADAPTERS FOR ELECTROMECHANICAL SURGICAL INSTRUMENTS; Attorney Docket No. END8277USNP/170219;

U.S. patent application Ser. No. ______, entitled SURGICAL END EFFECTORS WITH CLAMPING ASSEMBLIES CONFIGURED TO INCREASE JAW APERTURE RANGES; Attorney Docket No. END8278USNP/170220;

U.S. patent application Ser. No. ______, entitled SURGICAL END EFFECTORS WITH PIVOTAL JAWS CONFIGURED TO TOUCH AT THEIR RESPECTIVE DISTAL ENDS WHEN FULLY CLOSED; Attorney Docket No. END8283USNP/170223;

U.S. patent application Ser. No. ______, entitled ADAPTERS WITH END EFFECTOR POSITION SENSING AND CONTROL ARRANGEMENTS FOR USE IN CONNECTION WITH ELECTROMECHANICAL SURGICAL INSTRUMENTS; Attorney Docket No. END8281USNP/170228;

U.S. patent application Ser. No. ______, entitled DYNAMIC CLAMPING ASSEMBLIES WITH IMPROVED WEAR CHARACTERISTICS FOR USE IN CONNECTION WITH ELECTROMECHANICAL SURGICAL INSTRUMENTS; Attorney Docket No. END8279USNP/170222;

U.S. patent application Ser. No. ______, entitled ADAPTERS WITH FIRING STROKE SENSING ARRANGEMENTS FOR USE IN CONNECTION WITH ELECTROMECHANICAL SURGICAL INSTRUMENTS; Attorney Docket No. END8287USNP/170229;

U.S. patent application Ser. No. ______, entitled ADAPTERS WITH CONTROL SYSTEMS FOR CONTROLLING MULTIPLE MOTORS OF AN ELECTROMECHANICAL SURGICAL INSTRUMENT; Attorney Docket No. END8284USNP/170224;

U.S. patent application Ser. No. ______, entitled HANDHELD ELECTROMECHANICAL SURGICAL INSTRUMENTS WITH IMPROVED MOTOR CONTROL ARRANGEMENTS FOR POSITIONING COMPONENTS OF AN ADAPTER COUPLED THERETO; Attorney Docket No. END8285USNP/170225;

U.S. patent application Ser. No. ______, entitled SYSTEMS AND METHODS OF CONTROLLING A CLAMPING MEMBER FIRING RATE OF A SURGICAL INSTRUMENT; Attorney Docket No. END8280USNP/170226;

U.S. patent application Ser. No. ______, entitled SYSTEMS AND METHODS OF CONTROLLING A CLAMPING MEMBER; Attorney Docket No. END8335USNP/170231; and

U.S. patent application Ser. No. ______, entitled METHODS OF OPERATING SURGICAL END EFFECTORS; Attorney Docket No. END8298USNP/170218M.

Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. Well-known operations, components, and elements have not been described in detail so as not to obscure the embodiments described in the specification. The reader will understand that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and illustrative. Variations and changes thereto may be made without departing from the scope of the claims.

The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include” (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are open-ended linking verbs. As a result, a surgical system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, an element of a system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more features possesses those one or more features, but is not limited to possessing only those one or more features.

The terms “proximal” and “distal” are used herein with reference to a clinician manipulating the handle portion of the surgical instrument. The term “proximal” refers to the portion closest to the clinician and the term “distal” refers to the portion located away from the clinician. It will be further appreciated that, for convenience and clarity, spatial terms such as “vertical”, “horizontal”, “up”, and “down” may be used herein with respect to the drawings. However, surgical instruments are used in many orientations and positions, and these terms are not intended to be limiting and/or absolute.

Various exemplary devices and methods are provided for performing laparoscopic and minimally invasive surgical procedures. However, the reader will readily appreciate that the various methods and devices disclosed herein can be used in numerous surgical procedures and applications including, for example, in connection with open surgical procedures. As the present Detailed Description proceeds, the reader will further appreciate that the various instruments disclosed herein can be inserted into a body in any way, such as through a natural orifice, through an incision or puncture hole formed in tissue, etc. The working portions or end effector portions of the instruments can be inserted directly into a patient's body or can be inserted through an access device that has a working channel through which the end effector and elongate shaft of a surgical instrument can be advanced.

A surgical stapling system can comprise a shaft and an end effector extending from the shaft. The end effector comprises a first jaw and a second jaw. The first jaw comprises a staple cartridge. The staple cartridge is insertable into and removable from the first jaw; however, other embodiments are envisioned in which a staple cartridge is not removable from, or at least readily replaceable from, the first jaw. The second jaw comprises an anvil configured to deform staples ejected from the staple cartridge. The second jaw is pivotable relative to the first jaw about a closure axis; however, other embodiments are envisioned in which the first jaw is pivotable relative to the second jaw. The surgical stapling system further comprises an articulation joint configured to permit the end effector to be rotated, or articulated, relative to the shaft. The end effector is rotatable about an articulation axis extending through the articulation joint. Other embodiments are envisioned which do not include an articulation joint.

The staple cartridge comprises a cartridge body. The cartridge body includes a proximal end, a distal end, and a deck extending between the proximal end and the distal end. In use, the staple cartridge is positioned on a first side of the tissue to be stapled and the anvil is positioned on a second side of the tissue. The anvil is moved toward the staple cartridge to compress and clamp the tissue against the deck. Thereafter, staples removably stored in the cartridge body can be deployed into the tissue. The cartridge body includes staple cavities defined therein wherein staples are removably stored in the staple cavities. The staple cavities are arranged in six longitudinal rows. Three rows of staple cavities are positioned on a first side of a longitudinal slot and three rows of staple cavities are positioned on a second side of the longitudinal slot. Other arrangements of staple cavities and staples may be possible.

The staples are supported by staple drivers in the cartridge body. The drivers are movable between a first, or unfired position, and a second, or fired, position to eject the staples from the staple cavities. The drivers are retained in the cartridge body by a retainer which extends around the bottom of the cartridge body and includes resilient members configured to grip the cartridge body and hold the retainer to the cartridge body. The drivers are movable between their unfired positions and their fired positions by a sled. The sled is movable between a proximal position adjacent the proximal end and a distal position adjacent the distal end. The sled comprises a plurality of ramped surfaces configured to slide under the drivers and lift the drivers, and the staples supported thereon, toward the anvil.

Further to the above, the sled is moved distally by a firing member. The firing member is configured to contact the sled and push the sled toward the distal end. The longitudinal slot defined in the cartridge body is configured to receive the firing member. The anvil also includes a slot configured to receive the firing member. The firing member further comprises a first cam which engages the first jaw and a second cam which engages the second jaw. As the firing member is advanced distally, the first cam and the second cam can control the distance, or tissue gap, between the deck of the staple cartridge and the anvil. The firing member also comprises a knife configured to incise the tissue captured intermediate the staple cartridge and the anvil. It is desirable for the knife to be positioned at least partially proximal to the ramped surfaces such that the staples are ejected ahead of the knife.

FIG. 1 depicts a motor-driven (electromechanical) surgical system 1 that may be used to perform a variety of different surgical procedures. As can be seen in that Figure, one example of the surgical system 1 includes a powered handheld electromechanical surgical instrument 100 that is configured for selective attachment thereto of a plurality of different surgical tool implements (referred to herein as “adapters”) that are each configured for actuation and manipulation by the powered handheld electromechanical surgical instrument. As illustrated in FIG. 1, the handheld surgical instrument 100 is configured for selective connection with an adapter 200, and, in turn, adapter 200 is configured for selective connection with end effectors that comprise a single use loading unit (“SULU”) or a disposable loading unit (“DLU”) or a multiple use loading unit (“MULU”). In another surgical system embodiment, various forms of adapter 200 may also be effectively employed with a tool drive assembly of a robotically controlled or automated surgical system. For example, the surgical tool assemblies disclosed herein may be employed with various robotic systems, instruments, components and methods such as, but not limited to, those disclosed in U.S. Pat. No. 9,072,535, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, which is hereby incorporated by reference herein in its entirety.

As illustrated in FIGS. 1 and 2, surgical instrument 100 includes a power-pack 101 and an outer shell housing 10 that is configured to selectively receive and substantially encase the power-pack 101. The power pack 101 may also be referred to herein as handle assembly 101. One form of surgical instrument 100, for example, is disclosed in International Publication No. WO 2016/057225 A1, International Application No. PCT/US2015/051837, entitled HANDHELD ELECTROMECHANICAL SURGICAL SYSTEM, the entire disclosure of which is hereby incorporated by reference herein. Various features of surgical instrument 100 will not be disclosed herein beyond what is necessary to understand the various features of the inventions disclosed herein with it being understood that further details may be gleaned from reference to WO 2016/057225 A1 and other references incorporated by reference herein.

As illustrated in FIG. 3, outer shell housing 10 includes a distal half-section 10 a and a proximal half-section 10 b that is pivotably connected to distal half-section 10 a by a hinge 16 located along an upper edge of distal half-section 10 a and proximal half-section 10 b. When joined, distal and proximal half-sections 10 a, 10 b define a shell cavity 10 c therein in which the power-pack 101 is selectively situated. Each of distal and proximal half-sections 10 a, 10 b includes a respective upper shell portion 12 a, 12 b, and a respective lower shell portion 14 a, 14 b. Lower shell portions 14 a, 14 b define a snap closure feature 18 for selectively securing the lower shell portions 14 a, 14 b to one another and for maintaining shell housing 10 in a closed condition. Distal half-section 10 a of shell housing 10 defines a connecting portion 20 that is configured to accept a corresponding drive coupling assembly 210 of adapter 200 (see FIG. 5). Specifically, distal half-section 10 a of shell housing 10 has a recess that receives a portion of drive coupling assembly 210 of adapter 200 when adapter 200 is mated to surgical instrument 100.

Connecting portion 20 of distal half-section 10 a defines a pair of axially extending guide rails 21 a, 21 b that project radially inward from inner side surfaces thereof as shown in FIG. 5. Guide rails 21 a, 21 b assist in rotationally orienting adapter 200 relative to surgical instrument 100 when adapter 200 is mated to surgical instrument 100. Connecting portion 20 of distal half-section 10 a defines three apertures 22 a, 22 b, 22 c that are formed in a distally facing surface thereof and which are arranged in a common plane or line with one another. Connecting portion 20 of distal half-section 10 a also defines an elongate slot 24 also formed in the distally facing surface thereof. Connecting portion 20 of distal half-section 10 a further defines a female connecting feature 26 (see FIG. 2) formed in a surface thereof. Female connecting feature 26 selectively engages with a male connecting feature of adapter 200.

Distal half-section 10 a of shell housing 10 supports a distal facing toggle control button 30. The toggle control button 30 is capable of being actuated in a left, right, up and down direction upon application of a corresponding force thereto or a depressive force thereto. Distal half-section 10 a of shell housing 10 supports a right-side pair of control buttons 32 a, 32 b (see FIG. 3); and a left-side pair of control button 34 a, 34 b (see FIG. 2). The right-side control buttons 32 a, 32 b and the left-side control buttons 34 a, 34 b are capable of being actuated upon application of a corresponding force thereto or a depressive force thereto. Proximal half-section 10 b of shell housing 10 supports a right-side control button 36 a (see FIG. 3) and a left-side control button 36 b (see FIG. 2). Right-side control button 36 a and left-side control button 36 b are capable of being actuated upon application of a corresponding force thereto or a depressive force thereto.

Shell housing 10 includes a sterile barrier plate assembly 60 selectively supported in distal half-section 10 a. Specifically, the sterile barrier plate assembly 60 is disposed behind connecting portion 20 of distal half-section 10 a and within shell cavity 10 c of shell housing 10. The plate assembly 60 includes a plate 62 rotatably supporting three coupling shafts 64 a, 64 b, 64 c (see FIGS. 3 and 5). Each coupling shaft 64 a, 64 b, 64 c extends from opposed sides of plate 62 and has a tri-lobe transverse cross-sectional profile. Each coupling shaft 64 a, 64 b, 64 c extends through the respective apertures 22 a, 22 b, 22 c of connecting portion 20 of distal half-section 10 a when the sterile barrier plate assembly 60 is disposed within shell cavity 10 c of shell housing 10. The plate assembly 60 further includes an electrical pass-through connector 66 supported on plate 62. Pass-through connector 66 extends from opposed sides of plate 62. Pass-through connector 66 defines a plurality of contact paths each including an electrical conduit for extending an electrical connection across plate 62. When the plate assembly 60 is disposed within shell cavity 10 c of shell housing 10, distal ends of coupling shaft 64 a, 64 b, 64 c and a distal end of pass-through connector 66 are disposed or situated within connecting portion 20 of distal half-section 10 a of shell housing 10, and are configured to electrically and/or mechanically engage respective corresponding features of adapter 200.

Referring to FIGS. 3 and 4, the power-pack or the handle assembly 101 includes an inner handle housing 110 having a lower housing portion 104 and an upper housing portion 108 extending from and/or supported on lower housing portion 104. Lower housing portion 104 and upper housing portion 108 are separated into a distal half section 110 a and a proximal half-section 110 b connectable to distal half-section 110 a by a plurality of fasteners. When joined, distal and proximal half-sections 110 a, 110 b define the inner handle housing 110 having an inner housing cavity 110 c therein in which a power-pack core assembly 106 is situated. Power-pack core assembly 106 is configured to control the various operations of surgical instrument 100.

Distal half-section 110 a of inner handle housing 110 supports a distal toggle control interface 130 that is in operative registration with the distal toggle control button 30 of shell housing 10. In use, when the power-pack 101 is disposed within shell housing 10, actuation of the toggle control button 30 exerts a force on toggle control interface 130. Distal half-section 110 a of inner handle housing 110 also supports a right-side pair of control interfaces (not shown), and a left-side pair of control interfaces 132 a, 132 b. In use, when the power-pack 101 is disposed within shell housing 10, actuation of one of the right-side pair of control buttons or the left-side pair of control button of distal half-section 10 a of shell housing 10 exerts a force on a respective one of the right-side pair of control interfaces 132 a, 132 b or the left-side pair of control interfaces 132 a, 132 b of distal half-section 110 a of inner handle housing 110.

With reference to FIGS. 1-5, inner handle housing 110 provides a housing in which power-pack core assembly 106 is situated. Power-pack core assembly 106 includes a battery circuit 140, a controller circuit board 142 and a rechargeable battery 144 configured to supply power to any of the electrical components of surgical instrument 100. Controller circuit board 142 includes a motor controller circuit board 142 a, a main controller circuit board 142 b, and a first ribbon cable 142 c interconnecting motor controller circuit board 142 a and main controller circuit board 142 b. Power-pack core assembly 106 further includes a display screen 146 supported on main controller circuit board 142 b. Display screen 146 is visible through a clear or transparent window 110 d (see FIG. 3) provided in proximal half-section 110 b of inner handle housing 110. It is contemplated that at least a portion of inner handle housing 110 may be fabricated from a transparent rigid plastic or the like. It is further contemplated that shell housing 10 may either include a window formed therein (in visual registration with display screen 146 and with window 110 d of proximal half-section 110 b of inner handle housing 110, and/or shell housing 10 may be fabricated from a transparent rigid plastic or the like.

Power-pack core assembly 106 further includes a first motor 152, a second motor 154, and a third motor 156 that are supported by motor bracket 148 and are each electrically connected to controller circuit board 142 and battery 144. Motors 152, 154, 156 are disposed between motor controller circuit board 142 a and main controller circuit board 142 b. Each motor 152, 154, 156 includes a respective motor shaft 152 a, 154 a, 156 a extending therefrom. Each motor shaft 152 a, 154 a, 156 a has a tri-lobe transverse cross-sectional profile for transmitting rotative forces or torque. Each motor 152, 154, 156 is controlled by a respective motor controller. Rotation of motor shafts 152 a, 154 a, 156 a by respective motors 152, 154, 156 function to drive shafts and/or gear components of adapter 200 in order to perform the various operations of surgical instrument 100. In particular, motors 152, 154, 156 of power-pack core assembly 106 are configured to drive shafts and/or gear components of adapter 200.

As illustrated in FIGS. 1 and 5, surgical instrument 100 is configured for selective connection with adapter 200, and, in turn, adapter 200 is configured for selective connection with end effector 500. Adapter 200 includes an outer knob housing 202 and an outer tube 206 that extends from a distal end of knob housing 202. Knob housing 202 and outer tube 206 are configured and dimensioned to house the components of adapter assembly 200. Outer tube 206 is dimensioned for endoscopic insertion, in particular, that outer tube is passable through a typical trocar port, cannula or the like. Knob housing 202 is dimensioned to not enter the trocar port, cannula of the like. Knob housing 202 is configured and adapted to connect to connecting portion 20 of the outer shell housing 10 of surgical instrument 100.

Adapter 200 is configured to convert a rotation of either of first or second coupling shafts 64 a, 64 b of surgical instrument 100 into axial translation useful for operating a drive assembly 540 and an articulation link 560 of end effector 500, as illustrated in FIG. 10 and as will be described in greater detail below. As illustrated in FIG. 6, adapter 200 includes the proximal inner housing assembly 204 that rotatably supports a first rotatable proximal drive shaft 212, a second rotatable proximal drive shaft 214, and a third rotatable proximal drive shaft 216 therein. Each proximal drive shaft 212, 214, 216 functions as a rotation receiving member to receive rotational forces from respective coupling shafts 64 a, 64 b and 64 c of surgical instrument 100. In addition, the drive coupling assembly 210 of adapter 200 is also configured to rotatably support first, second and third connector sleeves 218, 220 and 222, respectively, arranged in a common plane or line with one another. Each connector sleeve 218, 220, 222 is configured to mate with respective first, second and third coupling shafts 64 a, 64 b, 64 c of surgical instrument 100, as described above. Each connector sleeves 218, 222, 220 is further configured to mate with a proximal end of respective first, second, and third proximal drive shafts 212, 214, 216 of adapter 200.

Drive coupling assembly 210 of adapter 200 also includes a first, a second, and a third biasing member 224, 226, and 228 disposed distally of respective first, second, and third connector sleeves 218, 220, 222. Each biasing members 224, 226, and 228 is disposed about respective first, second, and third rotatable proximal drive shaft 212, 214, and 216. Biasing members 224, 226, and 228 act on respective connector sleeves 218, 222, and 220 to help maintain connector sleeves 218, 222. and 220 engaged with the distal end of respective coupling shafts 64 a, 64 b, and 64 c of surgical instrument 100 when adapter 200 is connected to surgical instrument 100.

Also in the illustrated arrangement, adapter 200 includes first, second, and third drive converting assemblies 240, 250, 260, respectively, that are each disposed within inner housing assembly 204 and outer tube 206. Each drive converting assembly 240, 250, 260 is configured and adapted to transmit or convert a rotation of a first, second, and third coupling shafts 64 a, 64 b, and 64 c of surgical instrument 100 into axial translation of an articulation driver or bar 258 of adapter 200, to effectuate articulation of end effector 500; a rotation of a ring gear 266 of adapter 200, to effectuate rotation of adapter 200; or axial translation of a distal drive member 248 of adapter 200 to effectuate closing, opening, and firing of end effector 500.

Still referring to FIG. 6, first force/rotation transmitting/converting assembly 240 includes first rotatable proximal drive shaft 212, which, as described above, is rotatably supported within inner housing assembly 204. First rotatable proximal drive shaft 212 includes a non-circular or shaped proximal end portion configured for connection with first connector sleeve 218 which is connected to respective first coupling shaft 64 a of surgical instrument 100. First rotatable proximal drive shaft 212 includes a threaded distal end portion 212 b. First force/rotation transmitting/converting assembly 240 further includes a drive coupling nut 244 that threadably engages the threaded distal end portion 212 b of first rotatable proximal drive shaft 212, and which is slidably disposed within outer tube 206. Drive coupling nut 244 is slidably keyed within proximal core tube portion of outer tube 206 so as to be prevented from rotation as first rotatable proximal drive shaft 212 is rotated. In this manner, as the first rotatable proximal drive shaft 212 is rotated, drive coupling nut 244 is translated along threaded distal end portion 212 b of first rotatable proximal drive shaft 212 and, in turn, through and/or along outer tube 206.

First force/rotation transmitting/converting assembly 240 further includes a distal drive member 248 that is mechanically engaged with drive coupling nut 244, such that axial movement of drive coupling nut 244 results in a corresponding amount of axial movement of distal drive member 248. The distal end portion of distal drive member 248 supports a connection member 247 configured and dimensioned for selective engagement with an engagement member 546 of a drive assembly 540 of end effector 500 (FIG. 10). Drive coupling nut 244 and/or distal drive member 248 function as a force transmitting member to components of end effector 500. In operation, as first rotatable proximal drive shaft 212 is rotated, as a result of the rotation of first coupling shaft 64 a of surgical instrument 100, drive coupling nut 244 is translated axially along first rotatable proximal drive shaft 212. As drive coupling nut 244 is translated axially along first rotatable proximal drive shaft 212, distal drive member 248 is translated axially relative to outer tube 206. As distal drive member 248 is translated axially, with connection member 247 connected thereto and engaged with a hollow drive member 548 attached to drive assembly 540 of end effector 500 (FIG. 10), distal drive member 248 causes concomitant axial translation of drive assembly 540 of end effector 500 to effectuate a closure of a tool assembly portion 600 of the end effector 500 and a firing of various components within the tool assembly.

Still referring to FIG. 6, second drive converting assembly 250 of adapter 200 includes second proximal drive shaft 214 that is rotatably supported within inner housing assembly 204. Second rotatable proximal drive shaft 214 includes a non-circular or shaped proximal end portion configured for connection with second coupling shaft 64 c of surgical instrument 100. Second rotatable proximal drive shaft 214 further includes a threaded distal end portion 214 a configured to threadably engage an articulation bearing housing 253 of an articulation bearing assembly 252. Referring to FIGS. 6-9, the articulation bearing housing 253 supports an articulation bearing 255 that has an inner race 257 that is independently rotatable relative to an outer race 259. Articulation bearing housing 253 has a non-circular outer profile, for example tear-dropped shaped, that is slidably and non-rotatably disposed within a complementary bore (not shown) of inner housing hub 204 a. Second drive converting assembly 250 of adapter 200 further includes articulation bar 258 that has a proximal portion that is secured to inner race 257 of articulation bearing 255. A distal portion of articulation bar 258 includes a slot 258 a therein, which is configured to accept a hook 562 the articulation link 560 (FIG. 10) of end effector 500. Articulation bar 258 functions as a force transmitting member to components of end effector 500. In the illustrated arrangement and as further discussed in WO 2016/057225 A1, articulation bearing assembly 252 is both rotatable and longitudinally translatable and is configured to permit free, unimpeded rotational movement of end effector 500 when its first and second jaw members 610, 700 are in an approximated position and/or when jaw members 610, 700 are articulated.

In operation, as second proximal drive shaft 214 is rotated, the articulation bearing assembly 252 is axially translated along threaded distal end portion 214 a of second proximal drive shaft 214, which in turn, causes articulation bar 258 to be axially translated relative to outer tube 206. As articulation bar 258 is translated axially, articulation bar 258, being coupled to articulation link 560 of end effector 500, causes concomitant axial translation of articulation link 560 of end effector 500 to effectuate an articulation of tool assembly 600. Articulation bar 258 is secured to inner race 257 of articulation bearing 253 and is thus free to rotate about the longitudinal axis relative to outer race 259 of articulation bearing 253.

As illustrated in FIG. 6, adapter 200 includes a third drive converting assembly 260 that is supported in inner housing assembly 204. Third drive converting assembly 260 includes rotation ring gear 266 that is fixedly supported in and connected to outer knob housing 202. Ring gear 266 defines an internal array of gear teeth 266 a and includes a pair of diametrically opposed, radially extending protrusions 266 b. Protrusions 266 b are configured to be disposed within recesses defined in outer knob housing 202, such that rotation of ring gear 266 results in rotation of outer knob housing 202, and vice a versa. Third drive converting assembly 260 further includes third rotatable proximal drive shaft 216 which, as described above, is rotatably supported within inner housing assembly 204. Third rotatable proximal drive shaft 216 includes a non-circular or shaped proximal end portion that is configured for connection with third connector 220. Third rotatable proximal drive shaft 216 includes a spur gear 216 keyed to a distal end thereof. A reversing spur gear 264 inter-engages spur gear 216 a of third rotatable proximal drive shaft 216 to gear teeth 266 a of ring gear 266. In operation, as third rotatable proximal drive shaft 216 is rotated, due to a rotation of the third coupling shaft 64 b of surgical instrument 100, spur gear 216 a of third rotatable proximal drive shaft 216 engages reversing gear 264 causing reversing gear 264 to rotate. As reversing gear 264 rotates, ring gear 266 also rotates thereby causing outer knob housing 202 to rotate. Rotation of the outer knob housing 202 causes the outer tube 206 to rotate about longitudinal axis of adapter 200. As outer tube 206 is rotated, end effector 500 that is connected to a distal end portion of adapter 200, is also rotated about a longitudinal axis of adapter 200.

Adapter 200 further includes an attachment/detachment button 272 (FIG. 5) that is supported on a stem 273 (FIG. 6) that projects from drive coupling assembly 210 of adapter 200. The attachment/detachment button 272 is biased by a biasing member (not shown) that is disposed within or around stem 273, to an un-actuated condition. Button 272 includes a lip or ledge that is configured to snap behind a corresponding lip or ledge of connecting portion 20 of the surgical instrument 100. As also discussed in WO 2016/057225 A1, the adapter 200 may further include a lock mechanism 280 for fixing the axial position of distal drive member 248. As can be seen in FIG. 21, for example, lock mechanism 280 includes a button 282 that is slidably supported on outer knob housing 202. Lock button 282 is connected to an actuation bar (not shown) that extends longitudinally through outer tube 206. Actuation bar moves upon a movement of lock button 282. In operation, in order to lock the position and/or orientation of distal drive member 248, a user moves lock button 282 from a distal position to a proximal position, thereby causing the lock out (not shown) to move proximally such that a distal face of the lock out moves out of contact with camming member 288, which causes camming member 288 to cam into recess 249 of distal drive member 248. In this manner, distal drive member 248 is prevented from distal and/or proximal movement. When lock button 282 is moved from the proximal position to the distal position, the distal end of actuation bar moves distally into the lock out (not shown), against the bias of a biasing member (not shown), to force camming member 288 out of recess 249, thereby allowing unimpeded axial translation and radial movement of distal drive member 248.

Returning again to FIG. 6, adapter 200 includes an electrical assembly 290 supported on and in outer knob housing 202 and inner housing assembly 204. Electrical assembly 290 includes a plurality of electrical contact blades 292, supported on a circuit board 294, for electrical connection to pass-through connector of plate assembly of shell housing 10 of surgical instrument 100. Electrical assembly 290 serves to allow for calibration and communication information (i.e., life-cycle information, system information, force information) to pass to the circuit board of surgical instrument 100 via an electrical receptacle portion of the power-pack core assembly 106 of surgical instrument 100. Electrical assembly 290 further includes a strain gauge 296 that is electrically connected to circuit board 294. Strain gauge 296 is mounted within the inner housing assembly 204 to restrict rotation of the strain gauge 296 relative thereto. First rotatable proximal drive shaft 212 extends through strain gauge 296 to enable the strain gauge 296 to provide a closed-loop feedback to a firing/clamping load exhibited by first rotatable proximal drive shaft 212. Electrical assembly 290 also includes a slip ring 298 that is non-rotatably and slidably disposed along drive coupling nut 244 of outer tube 206. Slip ring 298 is in electrical connection with circuit board 294 and serves to permit rotation of first rotatable proximal drive shaft 212 and axial translation of drive coupling nut 244 while still maintaining electrical contact of slip ring 298 with at least another electrical component within adapter 200, and while permitting the other electrical components to rotate about first rotatable proximal drive shaft 212 and drive coupling nut 244.

Still referring to FIG. 6, inner housing assembly 204 includes a hub 205 that has a distally oriented annular wall 207 that defines a substantially circular outer profile. Hub 205 includes a substantially tear-drop shaped inner recess or bore that is shaped and dimensioned to slidably receive articulation bearing assembly 252 therewithin. Inner housing assembly 204 further includes a ring plate 254 that is secured to a distal face of distally oriented annular wall 207 of hub 204 a. Ring plate 254 defines an aperture 254 a therethrough that is sized and formed therein so as to be aligned with second proximal drive shaft 214 and to rotatably receive a distal tip thereof. In this manner, the distal tip of the second proximal drive shaft 214 is supported and prevented from moving radially away from a longitudinal rotational axis of second proximal drive shaft 214 as second proximal drive shaft 214 is rotated to axially translate articulation bearing assembly 252.

Turning next to FIG. 10, in one example, the end effector 500 may be configured for a single use (“disposable loading unit—DLU”) and be similar to those DLU's disclosed in U.S. Patent Application Publication No. 2010/0301097, entitled LOADING UNIT HAVING DRIVE ASSEMBLY LOCKING MECHANISM, now U.S. Pat. No. 9,795,384, U.S. Patent Application Publication No. 2012/0217284, entitled LOCKING MECHANISM FOR USE WITH LOADING UNITS, now U.S. Pat. No. 8,292,158, and U.S. Patent Application Publication No. 2015/0374371, entitled ADAPTER ASSEMBLIES FOR INTERCONNECTING SURGICAL LOADING UNITS AND HANDLE ASSEMBLIES, the entire disclosures of each such references being hereby incorporated by reference herein. It is also contemplated that the end effector 500 may be configured for multiple uses (MULU) such as those end effectors disclosed in U.S. Patent Application Publication No. 2017/0095250, entitled MULTI-USE LOADING UNIT, the entire disclosure of which is hereby incorporated by reference herein.

The depicted surgical instrument 100 fires staples, but it may be adapted to fire any other suitable fastener such as clips and two-part fasteners. In the illustrated arrangement, the end effector 500 comprises a loading unit 510. The loading unit 510 comprises a proximal body portion 520 and a tool assembly 600. Tool assembly 600 includes a pair of jaw members including a first jaw member 610 that comprises an anvil assembly 612 and a second jaw member 700 that comprises a cartridge assembly 701. One jaw member is pivotal in relation to the other to enable the clamping of tissue between the jaw members. The cartridge assembly 701 is movable in relation to anvil assembly 612 and is movable between an open or unclamped position and a closed or approximated position. However, the anvil assembly 612, or both the cartridge assembly 701 and the anvil assembly 612, can be movable.

The cartridge assembly 701 has a cartridge body 702 and in some instances a support plate 710 that are attached to a channel 720 by a snap-fit connection, a detent, latch, or by another type of connection. The cartridge assembly 701 includes fasteners or staples 704 that are movably supported in a plurality of laterally spaced staple retention slots 706, which are configured as openings in a tissue contacting surface 708. Each slot 706 is configured to receive a fastener or staple therein. Cartridge body 702 also defines a plurality of cam wedge slots which accommodate staple pushers 709 and which are open on the bottom (i.e., away from tissue-contacting surface) to allow an actuation sled 712 to pass longitudinally therethrough. The cartridge assembly 701 is removable from channel 720 after the staples have been fired from cartridge body 702. Another removable cartridge assembly is capable of being loaded onto channel 720, such that surgical instrument 100 can be actuated again to fire additional fasteners or staples. Further details concerning the cartridge assembly may be found, for example, in U.S. Patent Application Publication No. 2017/0095250 as well as various other references that have been incorporated by reference herein.

Cartridge assembly 701 is pivotal in relation to anvil assembly 612 and is movable between an open or unclamped position and a closed or clamped position for insertion through a cannula of a trocar. Proximal body portion 520 includes at least a drive assembly 540 and an articulation link 560. In one arrangement, drive assembly 540 includes a flexible drive beam 542 that has a distal end 544 and a proximal engagement section 546. A proximal end of the engagement section 546 includes diametrically opposed inwardly extending fingers 547 that engage a hollow drive member 548 to fixedly secure drive member 548 to the proximal end of beam 542. Drive member 548 defines a proximal porthole which receives connection member 247 of drive tube 246 of first drive converting assembly 240 of adapter 200 when the end effector 500 is attached to the distal end of the adapter 200.

End effector 500 further includes a housing assembly 530 that comprises an outer housing 532 and an inner housing 534 that is disposed within outer housing 532. First and second lugs 536 are each disposed on an outer surface of a proximal end 533 of outer housing 532 and are configured to operably engage the distal end of the adapter 200 as discussed in further detail in WO 2016/057225 A1.

With reference to FIG. 10, for example, anvil assembly 612 includes an anvil cover 630 and an anvil plate 620, which includes a plurality of staple forming depressions. Anvil plate 620 is secured to an underside of anvil cover 630. When tool assembly 600 is in the approximated position, staple forming depressions are positioned in juxtaposed alignment with staple receiving slots of the cartridge assembly 701.

The tool assembly 600 includes a mounting assembly 800 that comprises an upper mounting portion 810 and a lower mounting portion 812. A mounting tail 632 protrudes proximally from a proximal end 631 of the anvil cover 630. A centrally-located pivot member 814 extends from each upper and lower mounting portions 810 and 812 through openings 822 that are formed in coupling members 820. In at least one arrangement, the pivot member 814 of the upper mounting portion 810 also extends through an opening 634 in the mounting tail 632 as well. Coupling members 820 each include an interlocking proximal portion 824 that is configured to be received in corresponding grooves formed in distal ends of the outer housing 532 and inner housing 534. Proximal body portion 520 of end effector 500 includes articulation link 560 that has a hooked proximal end 562. The articulation link 560 is dimensioned to be slidably positioned within a slot in the inner housing. A pair of H-block assemblies 830 are positioned adjacent the distal end of the outer housing 532 and adjacent the distal end 544 of axial drive assembly 540 to prevent outward buckling and bulging of the flexible drive beam 542 during articulation and firing of surgical stapling apparatus 10. Each H-block assembly 830 includes a flexible body 832 which includes a proximal end fixedly secured to the distal end of the outer housing 532 and a distal end that is fixedly secured to mounting assembly 800. In one arrangement, a distal end 564 of the articulation link is pivotally pinned to the right H block assembly 830. Axial movement of the articulation link 560 will cause the tool assembly to articulate relative to the body portion 520.

FIGS. 11-15 illustrate an adapter 200′ that is substantially identical to adapter 200 described above, except for the differences noted below. As can be seen in FIG. 11, the adapter 200′ includes an outer tube 206 that has a proximal end portion 910 that has a first diameter “FD” and is mounted within the outer knob housing 202. The proximal end portion 910 may be coupled to the inner housing assembly 204 or otherwise supported therein in the manners discussed in further detail in WO 2016/057225 A1 for example. The proximal end portion 910 extends proximally from a central tube portion 912 that has a second diameter “SD”. In the illustrated embodiment, an end effector 500 is coupled to a distal end 914 of a shaft assembly 203 or outer tube 206. The outer tube 206 defines a longitudinal axis LA that extends between the proximal end portion 910 and the distal end 914 as can be seen in FIG. 11. As can be seen in FIGS. 10 and 11, an outer sleeve 570 of the proximal body portion 520 of the end effector 500 has a distal end portion 572 and a proximal end portion 574. The proximal end portion 574 has a diameter SD′ that is approximately equal to the second diameter SD of the central tube portion 912. The distal end portion 572 has a third diameter “TD”. In one arrangement, FD and TD are approximately equal and greater than SD. Other arrangements are contemplated wherein FD and TD are not equal, but each are greater than SD. However, it is preferable that for most cases FD and TD are dimensioned for endoscopic insertion through a typical trocar port, cannula or the like. In at least one arrangement (FIG. 11), the outer sleeve 570 is formed with a flat or scalloped side 576 to facilitate improved access within the patient while effectively accommodating the various drive and articulation components of the adapter 200′. In addition, by providing the central tube portion 912 with a reduced diameter may afford the adapter 200′ with improved thoracic in-between rib access.

In at least one arrangement, channel 720, which may be machined or made of sheet metal, includes a pair of proximal holes 722 (FIG. 10) that are configured to align with a pair of corresponding holes 636 in the anvil cover 630 to receive corresponding pins or bosses 638 (FIG. 12) to facilitate a pivotal relationship between anvil assembly 612 and cartridge assembly 701. In the illustrated example, a dynamic clamping assembly 550 is attached to or formed at the distal end 544 of the flexible drive beam 542. The dynamic clamping assembly 550 includes a vertical body portion 552 that has a tissue cutting surface 554 formed thereon or attached thereto. See FIG. 10, for example. An anvil engagement feature 556 is formed on one end of the body portion 552 and comprises an anvil engagement tab 557 that protrudes from each lateral side of the body portion 552. Similarly, a channel engagement feature 558 is formed on the other end of the of the body portion 552 and comprises a channel engagement tab 559 that protrudes from each lateral side of the body portion 552. See FIG. 15.

As indicated above, the anvil assembly 612 includes an anvil plate 620. The anvil plate 620 includes an elongate slot 622 that is configured to accommodate the body portion 552 of the dynamic clamping assembly 550 as the dynamic clamping assembly 550 is axially advanced during the firing process. The elongate slot 622 is defined between two anvil plate ledges 624 that extend along each lateral side of the elongate slot 622. See FIG. 10. As the dynamic clamping assembly 550 is distally advanced, the anvil engagement tabs 557 slidably engage the anvil plate ledges 624 to retain the anvil assembly 612 clamped onto the target tissue. Similarly, during the firing operation, the body portion 552 of the dynamic clamping assembly 550 extends through a central slot in the channel 720 and the channel engagement tabs 559 slidably engage channel ledges 725 extending along each side of the central channel slot to retain the cartridge assembly 701 clamped onto the target tissue.

Turning to FIGS. 13 and 15, the channel 720 defines a docking area generally designated as 730 that is configured to accommodate the dynamic clamping assembly 550 when it is in its proximal most position referred to herein as an unfired or starting position. In particular, the docking area 730 is partially defined by planar docking surfaces 732 that provides clearance between the channel engagement tabs 559 on the dynamic clamping assembly 550 to enable the cartridge assembly 701 to pivot to a fully opened position. A ramped or camming surface 726 extends from a distal end of each of the docking surfaces 732. Ramped surface 726 is engaged by the dynamic clamping assembly 550 in order to move the anvil assembly 612 and the cartridge assembly 701 with respect to one another. Similar camming surface could be provided on the anvil assembly 612 in other embodiments. It is envisioned that ramped surfaces 726 may also facilitate the alignment and/or engagement between channel 720 and support plate 620 and/or cartridge body 702. As the drive assembly 540 is distally advanced (fired), the channel engagement tabs 559 on the dynamic clamping assembly 550 engage the corresponding ramped surfaces 726 to apply a closing motion to the cartridge assembly 701 thus closing the cartridge assembly 701 and the anvil assembly 612. Further distal translation of the dynamic clamping assembly 550 causes the actuation sled 712 to move distally through cartridge body 702, which causes cam wedges 713 of actuation sled 712 to sequentially engage staple pushers 709 to move staple pushers 709 vertically within staple retention slots 706 and eject staples 704 into staple forming depressions of anvil plate 620. Subsequent to the ejection of staples 704 from retention slots 706 (and into tissue), the cutting edge 554 of the dynamic clamping assembly 550 severs the stapled tissue as the tissue cutting edge 554 on the vertical body portion 552 of the dynamic clamping assembly 550 travels distally through a central slot 703 of cartridge body 702. After staples 704 have been ejected from cartridge body 702 and a user wishes to use the same instrument 10 to fire additional staples 704 (or another type of fastener or knife), the user can remove the loading unit 510 from the adapter 200′ and replace it with another fresh or unspent loading unit. In an alternative arrangement, the user may simply remove the spent cartridge body 702 and replace it with a fresh unspent or unfired cartridge body 702.

During a surgical procedure, it may be desirable for a clinician to be able to monitor the progress or location of a dynamic clamping member of the adapter being employed. FIGS. 16-21 illustrate another end effector 2500 that includes means for ascertaining a position of a dynamic clamping assembly 550 of the end effector 2500 to both close and serially fire staples from a staple cartridge while continuing to further close the jaws of the end effector 2500. In one form, the end effector 2500 includes a tool assembly 2600 that may be identical to the tool assembly 600 described above, except for the differences discussed herein. The tool assembly 2600 includes a first jaw 2610 that comprises an anvil assembly 2612 and a second jaw 2700 that that comprises a cartridge assembly 2701. In one form, the anvil assembly 2612 comprises an anvil plate 2620 that includes a staple forming undersurface 2626 which is configured in confronting relationship with the cartridge assembly 2701. An anvil cover 2630 is attached to the anvil plate 2620.

In the illustrated example, the anvil cover 2630 comprises a body portion 2632 that extends from a proximal end 2642 to a distal end 2644. As shown, the anvil cover 2630 may also include a pair of downwardly extending tissue stops 2646 that serve to prevent target tissue from extending proximally past the proximal-most staples that are stored in the cartridge assembly 2701. FIGS. 17 and 18 illustrate the tool assembly 2600 wherein the dynamic clamping assembly 550 is in a starting position. Stated another way, in FIGS. 17 and 18, the dynamic clamping assembly 550 is in its proximal-most position. As can be most particularly seen in FIG. 16, for example, the anvil cover body portion 2632 comprises a first lateral side portion 2634 and a second lateral side portion 2636 that is laterally spaced from the first lateral side portion 2634. A plurality of first jaw stiffener features 2650, 2652 extend between the first and second lateral side portions 2634 and 2636. The stiffener features 2650 and 2652 are longitudinally offset from each other to define a first jaw opening 2654 therebetween. Additionally, the first jaw stiffener feature 2650 is longitudinally separated from the proximal end portion 2642 by a proximal first jaw opening 2656 and the second jaw stiffener feature 2652 is longitudinally separated from the distal end portion 2644 by a distal first jaw opening 2658 as shown.

Turning next to FIG. 17, the second jaw 2700 comprises a channel 2720 that is configured to operably support the cartridge assembly 2701 therein. The channel 2720 comprises a channel body portion 2721 that includes a proximal end portion 2723 and a distal end portion 2726. The channel 2720 further comprises a primary lateral side portion 2727 and a secondary lateral side portion 2728 that is laterally spaced from the primary lateral side portion 2727. A plurality of second jaw stiffener features 2734, 2735 extend between the primary and secondary lateral side portions 2727 and 2728. The second jaw stiffener features 2734 and 2735 are longitudinally offset from each other to define a second jaw opening 2736 therebetween. Additionally, the second jaw stiffener feature 2734 is longitudinally separated from a proximal end portion 2725 by a proximal second jaw opening 2737 and the second jaw stiffener feature 2735 is longitudinally separated from the distal end portion 2726 by a distal second jaw opening 2738 as shown.

The first jaw stiffeners 2650, 2652 and the second jaw stiffeners 2734, 2735 serve to stiffen the first and second jaws 2610, 2700, respectively while clamping target tissue therebetween. Additionally, the longitudinally displaced openings 2654, 2656, 2658, 2736, 2737, 2738 enable the clinician to view the progress and location of the dynamic clamping assembly during firing (e.g., the portion of the distal advancement of the dynamic clamping assembly 550 wherein the staples are fired from the cartridge assembly 701). For example, as shown in FIG. 19, reference axis A₁ corresponds to the locations of the proximal-most staples or fasteners in the cartridge assembly 2701. Reference axis A₂ corresponds to the locations of the distal-most staples or fasteners in the cartridge assembly 2701. In the illustrated example, the proximal second jaw opening 2737 extends distally from the proximal-most fastener locations (represented by reference axis A₁) to the second jaw stiffener feature 2734 and the distal first jaw opening 2658 extends proximally from the distal most fastener locations (represented by axis A₂) to the first jaw stiffener feature 2652.

Still referring to FIG. 19, the proximal end portion 2642 of the first jaw 2610 is in vertical registration (e.g., directly above) with the proximal second jaw opening 2737 in the second jaw 2700 when the jaws 2610, 2700 are in their fully closed positions as shown. In at least one example, the longitudinal length LL₁ of the proximal end portion 2642 and the longitudinal length LL_(A) of the proximal second jaw opening 2737 are approximately equal. Likewise, the first proximal jaw opening 2656 is in vertical registration with the second jaw stiffener feature 2734 when the jaws are in the fully closed positions. The longitudinal length LL₂ of the proximal first jaw opening 2656 is approximately equal to the longitudinal length LL_(B) of the second jaw stiffener feature 2734. The first jaw stiffener feature 2650 is in vertical registration with the second jaw opening 2736. The longitudinal length LL₃ of the first jaw stiffener feature 2650 is approximately equal to the longitudinal length LL_(C) of the second jaw opening 2736. The second jaw stiffener feature 2735 is in vertical registration with the first jaw opening 2654. The longitudinal length LL_(D) of the second jaw stiffener feature 2735 is approximately equal to the longitudinal length LL₄ of the first jaw opening 2654. The first jaw stiffener feature 2652 is in vertical registration with the second jaw opening 2738. The longitudinal length LL₅ of the first jaw stiffener feature 2652 is approximately equal to the longitudinal length LL_(E) of the second jaw opening 2738. The distal-most first jaw opening 2658 is in vertical registration with the distal end portion 2726 of the second jaw 2700 that extends from the distal-most fastener location A₂ to the second jaw opening 2738. The longitudinal length of the distal first jaw opening LL₆ is approximately equal to the longitudinal length LL_(F) of the distal end portion 2726.

In the illustrated example, the first jaw stiffener features 2650, 2652, as well as the proximal end portion 2642 and distal end portion 2644 of the first jaw 2610, extend transversely to the longitudinal axis between the first and second lateral side portions 2634 and 2636 and have an arcuate cross-sectional shape. The first jaw stiffener features 2650, 2652, as well as the proximal end portion 2642 and distal end portion 2644 of the first jaw 2610, may also be referred to as “stiffener bridges”. Likewise the second jaw stiffener features 2734, 2735 as well as the proximal end portion 2725 and distal end portion 2726 of the second jaw 2700 extend transversely to the longitudinal axis LA between the primary and secondary lateral side portions 2727 and 2728 and have an arcuate cross-sectional shape. The second jaw stiffener features 2734, 2735, as well as the proximal end portion 2725 and distal end portion 2726 of the second jaw 2700 may also be referred to as “stiffener bridges”.

FIG. 19 illustrates a position of the dynamic clamping assembly 550 in a firing or ready to fire position. As can be seen in that Figure, a portion of the dynamic clamping assembly 550 may be viewed by the clinician through the proximal second jaw opening 2737. In FIG. 20, the dynamic clamping assembly 550 has been distally advanced and, when in that position, the clinician may view the position of the dynamic clamping assembly 550 through the first jaw opening 2654 as well as the second jaw opening 2736. FIG. 21 illustrates the position of the dynamic clamping assembly 550 in its final or ending position wherein the distal-most staples have been fired. As can be seen in that Figure, the position of the dynamic clamping assembly 550 is viewable through the first jaw opening 2658. Thus, by longitudinally staggering the positions of the first and second jaw stiffener features as well as the first and second jaw openings in the above-described manner, such arrangement serves to maintain a stiffness of the end effector 2500 and more particularly the tool assembly 2600 of the end effector 2500 and even more particularly the first and second jaws 2610, 2700 thereof when the first and second jaws are in their fully closed or clamped positions and the dynamic clamping assembly 550 is distally advanced to cut the clamped tissue and fire the staples supported in the cartridge assembly. In addition, such arrangement enables the clinician to observe a position of the dynamic clamping assembly 550 at any position during a firing stroke of the dynamic clamping assembly 550. As used in this context, the “firing stroke” means the range of movement of the dynamic clamping assembly 550 from a firing position FP or ready to fire position prior to firing any staples to an ending firing position wherein all of the staples have been fired thereby. Alternative arrangements are contemplated wherein additional stiffening features and jaw openings are employed in the above-described manner in the first and second jaws. Still other arrangements are contemplated wherein only one of the first and second jaws include the spaced stiffener features that permit the user to monitor the movement of the dynamic clamping assembly (firing member).

FIG.22 illustrates a conventional dynamic clamping assembly 550 applying clamping forces to an anvil assembly 612 which may lead to the undesirable deflection of the ledges 624 on the anvil plate 620 by the anvil engagement features 557 as well as the deflection of channel ledges formed in the channel 720 by the channel engagement features 559. Unlike end effectors which employ a secondary jaw closure system, such arrangement that employs the dynamic clamping assembly to apply all closure forces to the first and second jaws. Such design relies, for example, on very high local rolling forces to cause tissue compression and establish a proper tissue gap between the jaws. Separate and independent closure and firing systems, to the contrary, rely on projection of force as distal as possible.

FIG. 23 illustrates a portion of an anvil assembly 2800 that comprises an anvil plate 2810 that includes a staple forming undersurface 2812 thereon. The anvil plate 2810 includes an elongate slot 2814 that is configured to accommodate the body portion of a dynamic clamping assembly 550 as the dynamic clamping assembly is axially advanced during the firing process. The elongate slot 2814 is defined between two anvil plate ledges 2816 that extend along each lateral side of the slot 2814. As a dynamic clamping member is distally advanced, anvil engagement tabs or pins on the dynamic clamping assembly 550 slidably engage the anvil plate ledges 2816 to retain the anvil assembly 2800 clamped onto the target tissue. An anvil cover plate or an anvil cap 2820 is received on cap ledges 2818 on the anvil plate 2810 and may be welded or otherwise attached thereto. Each of the anvil plate ledges 2816 extends inwardly in a cantilever configuration and has a ledge width LW. As the dynamic clamping assembly 550 clampingly engages the anvil assembly 2800, the anvil engagement features or tabs 556 of the dynamic clamping assembly 550 engage the ledges 2816 to apply the closing motions thereto. In this arrangement, however, the ledges 2816 are more robust and have a ledge thickness LT that is greater than the ledge thickness of the ledges on an anvil plate 620, for example.

FIG. 24 illustrates another anvil assembly 2900 that comprises an anvil plate 2910 that includes a staple forming undersurface 2912 thereon. The anvil plate 2910 includes an elongate slot 2914 that is configured to accommodate the body portion of a dynamic clamping assembly 550 as the dynamic clamping assembly is axially advanced during the firing process. The elongate slot 2914 is defined between two anvil plate ledges 2916 that extend along each lateral side of the slot 2914. An anvil cover plate or an anvil cap 2920 is received on ledges 2918 on the anvil plate 2910 and may be welded or otherwise attached thereto. Each of the anvil plate ledges 2916 extend inwardly in a cantilever configuration. Although each ledge 2916 has a ledge thickness LT′ that is less than the ledge thickness LT (FIG. 23), each ledge 2916 has a ledge width LW′ that is less than the ledge width LW of ledges 2816. Such shorter ledges 2916 will experience less deflection that the ledges on the anvil plate 620, for example. Such arrangement represents an improvement over past anvil plate arrangements because the ledges 2916 are shorter which may limit the amount of deflection experienced during the high load advancement of the dynamic clamping assembly.

EXAMPLES Example 1

An end effector for use with a surgical instrument. In one example, the end effector comprises a first jaw that defines a first jaw longitudinal axis that extends between a first jaw proximal end and a first jaw distal end. The first jaw further comprises a plurality of first jaw stiffener features that are longitudinally offset from each other to define a first jaw opening therebetween. A second jaw is movably coupled to the first jaw such that the first jaw and the second jaw are movable relative to each other between a fully open and a fully closed position. The second jaw comprises a plurality of second jaw stiffener features that are longitudinally offset from each other to define a second jaw opening therebetween such that when the first and second jaws are in the fully closed position, each first jaw stiffening feature is in vertical registration with a corresponding one of the second jaw openings and each second jaw stiffening feature is in vertical registration with a corresponding one of the first jaw openings. The end effector further comprises means for selectively moving the first and second jaws between the fully open position and the fully closed position.

Example 2

The end effector of Example 1, wherein the plurality of first jaw stiffening features comprises a proximal first jaw stiffener that is spaced from a proximal end of the first jaw to define a proximal first jaw opening therebetween. A central first jaw stiffener is distally spaced from the proximal first jaw stiffener to define a central first jaw opening therebetween. A distal first jaw stiffener is spaced distally from the central first jaw stiffener to define a distal first jaw opening therebetween. In at least one example, the plurality of second jaw stiffener features comprises a proximal second jaw stiffener that is in vertical registration with the proximal first jaw opening when the first and second jaws are in the fully closed position. A central second jaw stiffener is spaced distally from the proximal second jaw stiffener to define a proximal second jaw opening therebetween that is in vertical registration with the proximal first jaw stiffener when the first and second jaws are in the fully closed position. A distal second jaw stiffener is spaced distally from the central second jaw stiffener to define a central second jaw opening therebetween that is in vertical registration with the central first jaw stiffener when the first and second jaws are in the fully closed position. The distal second jaw stiffener is spaced proximally from a distal end of the second jaw to define a distal second jaw opening therebetween that is in vertical registration with the distal first jaw stiffener when the first and second jaws are in the fully closed position.

Example 3

The end effector of Examples 1 or 2, wherein the first jaw comprises a first jaw body that has a first lateral side and a second lateral side that is laterally spaced from the first lateral side. Each first jaw stiffener feature extends between the first lateral side and the second lateral side. The second jaw comprises a second jaw body that defines a second jaw longitudinal axis that extends between a second jaw distal end and a second jaw proximal end. The second jaw further comprises a primary lateral side and a secondary lateral side that is spaced from the primary lateral side. Each second jaw stiffener feature extends between the primary lateral side and the secondary lateral side.

Example 4

The end effector of Example 3, wherein the first jaw stiffener feature is transverse to the first jaw longitudinal axis and wherein each second jaw stiffener feature is transverse to the second jaw longitudinal axis.

Example 5

The end effector of Examples 1, 2, 3 or 4, wherein the means for selectively moving comprises an axially movable dynamic clamping assembly that is selectively movable between a starting position that corresponds to the fully open position of the first and second jaws and an ending position. In at least one example, the axially movable dynamic clamping assembly comprises a vertically extending body portion that includes at least one first jaw engagement feature that is configured to slidably engage the first jaw and at least one second jaw engagement feature that is configured to slidably engage the second jaw.

Example 6

The end effector of Example 5, wherein at least one first jaw engagement feature is viewable through at least one of the first jaw openings in the first jaw or at least one second jaw engagement feature is viewable through at least one of the second jaw openings in the second jaw as the dynamic clamping assembly is axially moved within the end effector.

Example 7

The end effector of Example 3, wherein at least one first jaw engagement feature is viewable through at least one of the first jaw openings in the first jaw from one of the first and second lateral sides of the first jaw or at least one second jaw feature is viewable through at least one of the second jaw openings in the second jaw from one of the primary and secondary lateral sides of the second jaw as the dynamic clamping assembly is axially moved within the end effector.

Example 8

The end effector of Examples 1, 2, 3, 4, 5, 6 or 7, wherein the first jaw comprises a channel that is configured to support a surgical staple cartridge therein and wherein the second jaw comprises an anvil.

Example 9

The end effector of Example 5, wherein the vertically extending body portion comprises a tissue cutting surface.

Example 10

An end effector for use with a surgical instrument. In at least one example, the end effector comprises a first jaw and a second jaw that is movable coupled to the first jaw such that the first and second jaws are movable relative to each other between a fully open and a fully closed position. A dynamic clamping assembly is configured to engage the first and second jaws as the dynamic clamping assembly is axially moved from a starting position to an ending position to apply closing motions to the first and second jaws. At least one of the first and second jaws comprises stiffener features that are longitudinally spaced from each other by openings that are configured to permit viewing of the dynamic clamping assembly therethrough as the dynamic clamping assembly moves between the starting position and the ending position.

Example 11

The end effector of Example 10, wherein the dynamic clamping assembly comprises a vertically extending body portion that includes at least one first jaw engagement feature that is configured to slidably engage the first jaw and at least one second jaw engagement feature that is configured to slidably engage the second jaw.

Example 12

The end effector of Examples 10 or 11, wherein the first jaw comprises a channel that has a channel body that includes a first lateral channel side and a second lateral channel side that is laterally spaced from the first lateral channel side. A plurality of channel stiffener bridges are axially spaced from each other by channel openings and span between the first lateral channel side and the second lateral channel side.

Example 13

The end effector of Example 12, wherein the second jaw comprises an anvil that includes an anvil plate that is supported in confronting relationship with a cartridge that is supported in the channel. An anvil cover is coupled to the anvil plate and comprises a first lateral anvil side and a second lateral anvil side that is spaced from the first lateral anvil side and is connected thereto by a plurality of anvil stiffening bridges that are axially spaced from each other by anvil openings, the anvil stiffening bridges span between the first lateral anvil side and the second lateral anvil side.

Example 14

The end effector of Example 13, wherein each channel stiffener bridge is transverse to the first longitudinal axis and wherein the anvil defines a second longitudinal axis that extends between a proximal anvil end and a distal anvil end and wherein each anvil stiffener bridge is transverse to the second longitudinal axis.

Example 15

The end effector of Example 11, wherein the vertically extending body portion comprises a tissue cutting surface.

Example 16

The end effector of Example 13, wherein a portion of the dynamic clamping assembly is viewable through at least one of the channel openings in the channel from one of the first lateral channel side and the second lateral channel side or at least another portion of the dynamic clamping member is viewable through at least one of the anvil openings from one of the first anvil lateral side and the second anvil lateral side as the dynamic clamping assembly is axially moved within the end effector.

Example 17

A surgical loading unit for use with a motor driven surgical instrument. In at least one example, the loading unit comprises a housing that is configured to operably interface with a portion of the motor driven surgical instrument. A tool assembly is operably coupled to the housing and comprises a channel that supports a staple cartridge body therein. The channel defines a first longitudinal axis that extends between a proximal end and a distal end thereof. The channel further includes a segmented bottom portion that defines a plurality of channel stiffener bridges that are spaced apart by channel openings located therebetween. An anvil is pivotally coupled to the channel such that the channel and the anvil are movable relative to each other between a fully open and a fully closed position. The anvil includes a segmented top portion that defines a plurality of anvil stiffener bridges that are spaced apart by anvil openings located therebetween. A dynamic clamping assembly is configured to engage the channel and the anvil as the dynamic clamping assembly is axially moved from a starting position to an ending position to apply closing motions to the channel and the anvil. The dynamic clamping assembly is viewable through the channel openings or the anvil openings as the dynamic clamping assembly moves between the starting position and the ending position.

Example 18

The surgical loading unit of Example 17, wherein the tool assembly is pivotally coupled to the housing assembly for selective pivotal travel relative thereto.

Example 19

The surgical loading unit of Examples 17 or 18, wherein the housing is configured to be removably coupled to an adapter that is configured to be removably coupled to the motor driven surgical instrument.

Example 20

The surgical loading unit of Examples 17, 18 or 19, wherein the plurality of channel stiffener bridges comprises a proximal channel stiffener bridge that is spaced from a proximal end of the channel to define a proximal channel opening therebetween and a central channel stiffener bridge that is distally spaced from the proximal channel stiffener bridge to define a central channel opening therebetween and a distal channel stiffener bridge that is spaced distally from the central channel stiffener bridge to define a distal channel opening therebetween. The plurality of anvil stiffener bridges comprises a proximal anvil stiffener bridge that is in vertical registration with the proximal channel opening when the channel and anvil are in the fully closed position. A central anvil stiffener bridge is spaced distally from the proximal anvil stiffener bridge to define a proximal anvil opening therebetween that is in vertical registration with the proximal channel stiffener bridge when the channel and anvil are in the fully closed position. A distal anvil stiffener bridge is spaced distally from the central anvil stiffener bridge to define a central anvil opening therebetween that is in vertical registration with the central channel stiffener bridge when the channel and the anvil are in the fully closed position. The distal anvil stiffener bridge is spaced proximally from a distal end of the anvil to define a distal anvil opening therebetween that is in vertical registration with the distal channel stiffener bridge when the anvil and the channel are in the fully closed position.

Many of the surgical instrument systems described herein are motivated by an electric motor; however, the surgical instrument systems described herein can be motivated in any suitable manner. In various instances, the surgical instrument systems described herein can be motivated by a manually-operated trigger, for example. In certain instances, the motors disclosed herein may comprise a portion or portions of a robotically controlled system. Moreover, any of the end effectors and/or tool assemblies disclosed herein can be utilized with a robotic surgical instrument system. U.S. patent application Ser. No. 13/118,241, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, now U.S. Pat. No. 9,072,535, for example, discloses several examples of a robotic surgical instrument system in greater detail.

The surgical instrument systems described herein have been described in connection with the deployment and deformation of staples; however, the embodiments described herein are not so limited. Various embodiments are envisioned which deploy fasteners other than staples, such as clamps or tacks, for example. Moreover, various embodiments are envisioned which utilize any suitable means for sealing tissue. For instance, an end effector in accordance with various embodiments can comprise electrodes configured to heat and seal the tissue. Also, for instance, an end effector in accordance with certain embodiments can apply vibrational energy to seal the tissue.

Although various devices have been described herein in connection with certain embodiments, modifications and variations to those embodiments may be implemented. Particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, the particular features, structures, or characteristics illustrated or described in connection with one embodiment may be combined in whole or in part, with the features, structures or characteristics of one ore more other embodiments without limitation. Also, where materials are disclosed for certain components, other materials may be used. Furthermore, according to various embodiments, a single component may be replaced by multiple components, and multiple components may be replaced by a single component, to perform a given function or functions. The foregoing description and following claims are intended to cover all such modification and variations.

The devices disclosed herein can be designed to be disposed of after a single use, or they can be designed to be used multiple times. In either case, however, a device can be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps including, but not limited to, the disassembly of the device, followed by cleaning or replacement of particular pieces of the device, and subsequent reassembly of the device. In particular, a reconditioning facility and/or surgical team can disassemble a device and, after cleaning and/or replacing particular parts of the device, the device can be reassembled for subsequent use. Those skilled in the art will appreciate that reconditioning of a device can utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.

The devices disclosed herein may be processed before surgery. First, a new or used instrument may be obtained and, when necessary, cleaned. The instrument may then be sterilized. In one sterilization technique, the instrument is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and instrument may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, and/or high-energy electrons. The radiation may kill bacteria on the instrument and in the container. The sterilized instrument may then be stored in the sterile container. The sealed container may keep the instrument sterile until it is opened in a medical facility. A device may also be sterilized using any other technique known in the art, including but not limited to beta radiation, gamma radiation, ethylene oxide, plasma peroxide, and/or steam.

While this invention has been described as having exemplary designs, the present invention may be further modified within the spirit and scope of the disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. 

What is claimed is:
 1. An end effector for use with a surgical instrument, comprising: a first jaw defining a first jaw longitudinal axis between a first jaw proximal end and a first jaw distal end thereof and comprising a plurality of first jaw stiffener features longitudinally offset from each other to define a first jaw opening therebetween; a second jaw movably coupled to said first jaw such that said first jaw and said second jaw are movable relative to each other between a fully open and a fully closed position, said second jaw comprising a plurality of second jaw stiffener features longitudinally offset from each other to define a second jaw opening therebetween and wherein, when said first and second jaws are in said fully closed position, each said first jaw stiffening feature is in vertical registration with a corresponding one of said second jaw openings and each said second jaw stiffening feature is in vertical registration with a corresponding one of said first jaw openings; and means for selectively moving said first and second jaws between said fully open and said fully closed positions.
 2. The end effector of claim 1, wherein said plurality of said first jaw stiffening features comprises: a proximal first jaw stiffener that is spaced from a proximal end of said first jaw to define a proximal first jaw opening therebetween; a central first jaw stiffener that is distally spaced from said proximal first jaw stiffener to define a central first jaw opening therebetween; and a distal first jaw stiffener spaced distally from said central first jaw stiffener to define a distal first jaw opening therebetween and wherein said plurality of second jaw stiffener features comprises: a proximal second jaw stiffener in vertical registration with said proximal first jaw opening when said first and second jaws are in said fully closed position; a central second jaw stiffener spaced distally from said proximal second jaw stiffener to define a proximal second jaw opening therebetween that is in vertical registration with said proximal first jaw stiffener when said first and second jaws are in said fully closed position; and a distal second jaw stiffener spaced distally from said central second jaw stiffener to define a central second jaw opening therebetween that is in vertical registration with said central first jaw stiffener when said first and second jaws are in said fully closed position, said distal second jaw stiffener being spaced proximally from a distal end of said second jaw to define a distal second jaw opening therebetween that is in vertical registration with said distal first jaw stiffener when said first and second jaws are in said fully closed position.
 3. The end effector of claim 1, wherein said first jaw comprises a first jaw body that comprises a first lateral side and a second lateral side that is laterally spaced from said first lateral side and wherein each of said plurality of said first jaw stiffener features extend between said first lateral side and said second lateral side and wherein said second jaw comprises a second jaw body defining a second jaw longitudinal axis between a second jaw distal end and a second jaw proximal end and wherein said second jaw further comprises a primary lateral side and a secondary lateral side that is spaced from said primary lateral side and wherein each of said plurality of second jaw stiffener features extend between said primary lateral side and said secondary lateral side.
 4. The end effector of claim 3, wherein each said first jaw stiffener feature is transverse to said first jaw longitudinal axis and wherein each said second jaw stiffener feature is transverse to said second jaw longitudinal axis.
 5. The end effector of claim 1, wherein the means for selectively moving comprises an axially movable dynamic clamping assembly that is selectively movable between a starting position corresponding to said fully open position of said first and second jaws and an ending position, said axially movable dynamic clamping assembly comprising: a vertically extending body portion; at least one first jaw engagement feature configured to slidably engage said first jaw; and at least one second jaw engagement feature configured to slidably engage said second jaw.
 6. The end effector of claim 5, wherein said at least one first jaw engagement feature is viewable through at least one of said first jaw openings in said first jaw or said at least one second jaw engagement feature is viewable through at least one of said second jaw openings in said second jaw as said dynamic clamping assembly is axially moved within said end effector.
 7. The end effector of claim 3, wherein said at least one first jaw engagement feature is viewable through at least one of said first jaw openings in said first jaw from one of said first and second lateral sides of said first jaw or said at least one second jaw feature is viewable through at least one of said second jaw openings in said second jaw from one of said primary and secondary lateral sides of said second jaw as said dynamic clamping assembly is axially moved within said end effector.
 8. The end effector of claim 5, wherein said first jaw comprises a channel configured to support a surgical staple cartridge therein and wherein said second jaw comprises an anvil.
 9. The end effector of claim 8, wherein said vertically extending body portion comprises a tissue cutting surface.
 10. An end effector for use with a surgical instrument, comprising: a first jaw; a second jaw pivotally coupled to said first jaw such that said first and second jaws are movable relative to each other between a fully open and a fully closed position; and a dynamic clamping assembly configured to engage said first and second jaws as said dynamic clamping assembly is axially moved from a starting position to an ending position to apply closing motions to said first and second jaws and wherein at least one of said first and second jaws comprises stiffener features that are longitudinally spaced from each other by openings configured to permit viewing of the dynamic clamping assembly therethrough as said dynamic clamping assembly moves between said starting position and said ending position.
 11. The end effector of claim 10, wherein said dynamic clamping assembly comprises: a vertically extending body portion; at least one first jaw engagement feature configured to slidably engage said first jaw; and at least one second jaw engagement feature configured to slidably engage said second jaw.
 12. The end effector of claim 10, wherein said first jaw comprises a channel comprising: a channel body that comprises a first lateral channel side and a second lateral channel side that is laterally spaced from said first lateral channel side; and a plurality of channel stiffener bridges axially spaced from each other by channel openings and spanning between said first lateral channel side and said second lateral channel side.
 13. The end effector of claim 12, wherein said second jaw comprises an anvil comprising: an anvil plate supported in confronting relationship with a cartridge supported in said channel; and an anvil cover coupled to said anvil plate and comprising: a first lateral anvil side; and a second lateral anvil side spaced from said first lateral anvil side and connected thereto by said plurality of anvil stiffening bridges axially spaced from each other by anvil openings and spanning between said first lateral anvil side and said second lateral anvil side.
 14. The end effector of claim 13, wherein each said channel stiffener bridge is transverse to said first longitudinal axis and wherein said anvil defines a second longitudinal axis between a proximal anvil end and a distal anvil end and wherein each said anvil stiffener bridge is transverse to said second longitudinal axis.
 15. The end effector of claim 11, wherein said vertically extending body portion comprises a tissue cutting surface.
 16. The end effector of claim 12, wherein a portion of said dynamic clamping assembly is viewable through at least one of said channel openings in said channel from one of said first lateral channel side and said second lateral channel side or at least another portion of said dynamic clamping assembly is viewable through at least one of said anvil openings from one of said first anvil lateral side and said second anvil lateral side as said dynamic clamping assembly is axially moved within said end effector.
 17. A surgical loading unit for use with a motor driven surgical instrument, comprising: a housing configured to operably interface with a portion of the motor driven surgical instrument; a tool assembly operably coupled to said housing and comprising: a channel supporting a staple cartridge body therein, said channel defining a first longitudinal axis between a proximal end and a distal end thereof, said channel comprising a segmented bottom portion defining a plurality of channel stiffener bridges and channel openings therebetween; an anvil pivotally coupled to said channel such that said channel and said anvil are movable relative to each other between a fully open and a fully closed position, said anvil comprising a segmented top portion defining a plurality of anvil stiffener bridges and anvil openings therebetween; and a dynamic clamping assembly configured to engage said channel and said anvil as said dynamic clamping assembly is axially moved from a starting position to an ending position to apply closing motions to said channel and said anvil and viewable through said channel openings or said anvil openings as said dynamic clamping assembly moves between said starting position and said ending position.
 18. The surgical loading unit of claim 17, wherein said tool assembly is pivotally coupled to said housing assembly for selective pivotal travel relative thereto.
 19. The surgical loading unit of claim 18, wherein said housing is configured to be removably coupled to an adapter configured to be removably coupled to the motor driven surgical instrument.
 20. The surgical loading unit of claim 17, wherein said plurality of said channel stiffener bridges comprises: a proximal channel stiffener bridge spaced from a proximal end of said channel to define a proximal channel opening therebetween; a central channel stiffener bridge distally spaced from said proximal channel stiffener bridge to define a central channel opening therebetween; and a distal channel stiffener bridge spaced distally from said central channel stiffener bridge to define a distal channel opening therebetween and wherein said plurality of anvil stiffener bridges comprises: a proximal anvil stiffener bridge in vertical registration with said proximal channel opening when said channel and anvil are in said fully closed position; a central anvil stiffener bridge spaced distally from said proximal anvil stiffener bridge to define a proximal anvil opening therebetween that is in vertical registration with said proximal channel stiffener bridge when said channel and anvil are in said fully closed position; and a distal anvil stiffener bridge spaced distally from said central anvil stiffener bridge to define a central anvil opening therebetween that is in vertical registration with said central channel stiffener bridge when said channel and said anvil are in said fully closed position, said distal anvil stiffener bridge spaced proximally from a distal end of said anvil to define a distal anvil opening therebetween that is in vertical registration with said distal channel stiffener bridge when said anvil and said channel are in said fully closed position. 